SAFETY INSTRUCTION - Limatherm · PDF file- 5 - LIMATHERM SENSOR Sp. z o.o., 34-600 Limanowa,...

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LIMATHERM SENSOR Sp. z o.o., 34-600 Limanowa, ul. Tarnowska 1, tel. (18) 337 99 00 , fax (18) 337 99 10 www.limathermsensor.pl

DTR-Exd-01

(2010-10-07)

APPLICATION MANUAL

SAFETY INSTRUCTION

Flameproof temperature sensors

type *T**-Exd-*-*-*…

II 2 GD Ex d IIC T6

Ex tD A21 IP68 T85°C

or

I M2 Ex d I

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1. GENERALY INFORMATION

DIRECTIVE 94/9/EC - ATEX

ATEX Directive is the “New Approach Directive” which is in use in the members of EC States

from July 1, 2003. The main object of this directive is to stipulate requirements that are essential for

the free circulation of products within the European Economic Community. In order to do this,

National Standards need to be harmonized based on the article 100A in the Union Treaty. Starting

from July 1, 2003 products must satisfy the requirements of this directive before they can be marketed

and transported freely, or used. This is the first time that directive about equipment designed to

operate in an explosive atmosphere resulting from the presence of combustion dust. Therefore, zones

20, 21 and 22 are complementary to zones 0, 1 and 2 defined for gases and vaporous. The magnitude

of the risk of faults are the same in these zones. Trough its products marking requirements, the

directive introduces the concept of zones and gaseous atmospheres and/or atmospheres containing

dust in which the equipment may be installed.

TABLE 1: TYPES OF EXPLOSION PROTECTION APPLIED IN THE TEMPERATURE

SENSORS

Type of Ex protection Protection concept Marking Standard

flameproof contain the explosion, quench the flame d PN-EN 60079-1

increased safety mechanical, no arcs, no spark, no hot surfaces e PN-EN 60079-7

intrinically safe electrical, limitation of arcs and spark energy

and hot surfaces i PN-EN 50020

TABLE 2: WAYS OF EXPLOSION PROTECTION

FOR POTENTIALLY EXPLOSIVE ATMOSPHERES

Category Type of flameable

substance

Level of protection

characteristic of protection Zone Possible type of protection

Gr.I Gr.II

1G gases, mists,

vaporous - very high protection

level

- two independent ways

of protection

- resistance against two

independent damages

0 Ex ia, Ex dib or Ex d

with mechanical separation

1D dusts 20

- protection by enclosure, min. IP6X

- protection by restriction surface

temperature

- protection by avoiding spark ignition

M1 methane - -

2G gases, mists,

vaporous

- high protection level

- one way of protection

- damage expected

1 Ex ib or

Ex e or Ex d

2D dusts 21

- protection by enclosure, min IP6X


temperature

- protection by avoiding spark ignition

M2 methane - -

3G gases, mists,

vaporous

- normal level protection

- protection suitable for

normal working

conditions

2 Ex ib lub Ex e lub

Ex d

3D dusts 22

- protection by enclosure, min IP5X


temperature

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TABELA 3: ZONES CLASSIFICATION

Gases, vaporous, mists

G

Dusts

D Existing of explosion atmosphere Number value

Zone 0 Zone 20 Continously under normal operation

conditions > 1000 hours/year

Zone 1 Zone 21 Are likely existing under normal

operating conditions 10 ÷ 1000 hours/year

Zone 2 Zone 22 Not likely existing under normal

operating conditions < 10 hours/year

TEMPERATURE CLASS

Electrical apparatus Group II, Category 2G shall be qualified to the temperature class,

regarding maximum surface temperature reached under external working conditions.

TABELA 4:

Temperature class Maximum surface

temperature Ts

Spontaneous ignition

temperature of the gases

T1 450°C >450°C

T2 300°C > 300°C < 450°C

T3 200°C > 200°C < 300°C

T4 135°C > 135°C < 200°C

T5 100°C > 100°C < 135°C

T6 85°C > 85°C < 100°C

Because sensor manufacturer is not able to foresee actually operation conditions of the sensor

and also to fix temperature class, on the data sheet was declared temperature classes responding top

temperatures of the sensor for design of the each sensor. Actually, temperature class can be

respectively lower depend on surface temperature Ts reached in the working conditions.

! In any case the maximum surface temperature Ts

can’t be higher than spontaneous ignition temperature of the gases,

vaporous or mists.

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Table 5: TEMPERATURE CLASS FOR GASES GROUPS Acc.to Dz.U.Nr 92/90.

Temperature

class

Explosiveness

group

T1 T2 T3 T4 T5 T6

IIA

acetone,

propylene,

toluene,

carbon oxide,

ammonia

ethanol,

etyl alkohol,

n-butane,

cyclohexanone,

trichloroethylene

petrol,

cyclohexan,

n-decan,

n-hexan,

petroleum

acetic aldehyde

-

-

IIB

town gas,

hydrogen,

cyanide

ethylene oxide,

propylene oxide,

butadiene,

acrylonitryle

hydrogen sulfide

acroleline,

crotone

aldehyde

ethyl ether,

dioksan

-

-

IIC hydrogen acetylene hydrazyne - bisulfide carbon -

PERMISSIBLE MAXIMUM SURFACE TEMPERATURE

For electrical apparatus Group II, Category 2D shall be given maximum surface temperature reached

under working conditions.

! In any case maximum surface temperature Ts

can’t be higher than maximum surface temperature,

which is defined by:

Tsmax = 2/3 Tc Tc – dust cloud self-ignition temperature

Tsmax = T5 mm – 75 K T5mm – dust layer 5mm self-ignition

temperature

For dust layer thick from 5 to 50mm Tsmax shall be lower in accordance to

standard EN 61241-0

For dust layer excessively thick, estimating of maximum permissible surface

temperature shall be done under testing.

2. NOTES OF SAFETY

Flameproof temperature sensors are designed to use in hazardous location both gas and

dust atmospheres. If used incorrectly it is possible that application – related danger may arise.

Flameproof sensors may be installed, connected, commissioned, operated and

maintained by qualified and authorized personnel only, under strict observance of these

application manual, any relevant standards, legal requirements, and where appropriate, the

certificate.

http://dz.u.nr/

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3. APPLICATION

Temperature sensors are designed for temperature measurement in the industrial installations

for measurement, signalization, monitoring, remote controlling in a range of industry branches,

where hazardous areas of gas and dust occurs.

Standards according to 94/9/WE (ATEX):

PN-EN 60079-0

PN-EN 60079-1

PN-EN 61241-0

PN-EN 61241-1

Destination to the ATEX Directive 94/9/WE (ATEX):

… … GD

group of apparatus

I - apparatus intended for use

in mining

II - apparatus intended for use

in non mining industry

category of apparatus

2 – for group of apparatus II

M2 – for group of apparatus I

intended for gas hazardous areas (gr.II)

intended for dust hazardous areas (gr.II)

Kind of explosion protection for gases, vaporous and mist:

Ex d IIC T6

electrical devices explosion protected

type of explosion protection: flameproof

gas group

temperature class

Kind of explosion protection for dusts:

Ex tD A21 IP68 T85°C


tightness

protection degree

max. surface temperature

Kind of explosion protection for group of apparatus I:

Ex d I


type of explosion protection: flameproof

group of apparatus

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TABLE 6: PERMISSIBLE PLACES OF SENSORS INSTALLATION

Hazardous areas Category to ATEX

Explosion atmosphere of gases, vaporous,

mists

Zone 0 1G

Zone 1 1G, 2G

Zone 2 1G, 2G, 3G

Dust explosion atmosphere

Zone 20 1D

Zone 21 1D, 2D

Zone 22 1D, 2D, 3D

Way of marking mineral insulated cables

single without transmitter: without mark

double without transmitter: 2

single with transmitter: AP

Kind of element sensing

resistor: P1 for Pt100, P5 for Pt500, P10 for Pt1000

TC: J (Fe-CuNi); K (NiCr-Ni); T (Cu-CuNi); N (NiCrSi-NiSi)

diameter d: (acc. to data sheets) 3; 4.5; 6*; 8*

length Lw [mm]

resistor class: A, B or thermocouple class: 1, 2;

electrical connection for RTD: 2, 3, 4; hot junction: SO, SOA, SOB, SP for TC

transmitter temperature range for signal 4÷20mA: (...)°C

type of used transmitter (acc. to data sheets)

for Exd sensors

* standard performance with long sleeve (35mm),

if short sleeve (10mm) w requirement additional letter "k"

(only for Ø6 and Ø8).

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Way of marking temperature sensor

single without transmitter: without mark

double without transmitter: 2

single with transmitter: AP

Kind of element sensing:

resistor: OP thermocouple: TJ, TK, TT, TN

thermowell: GB, GN, P, I, T, SW, SWT or SWG

protection method: Exd

aluminium connection head: AS1, AS2, AS3, AS4

or stainless steel: NS1, NS2

thermowell material: e.g. 1.4541

immersion length L [mm] / thermowell diameter d [mm], e.g. 180/11

thermowell dimension thread: M20x1,5; G1/2; 1/2NPT ( thermowell GB, GN, SWG )

flange type: DN20 lub DN25 ( thermowell T, SWT )

resistor class: aA*, aB* or thermocouple class: 1, 2

electrical connection for RTD: 2, 3, 4; hot junction: SO, SOA, SOB, SP for TC

transmitter temperature range for signal 4÷20mA: (...)°C

type of used transmitter (acc. to data sheets)

diameter of supply cable: a (3,2mm-8,7mm); b (6,1mm-11,7mm); c (6,5mm-14mm) acc. to STAHL

* a = 1 for Pt100

a = 5 for Pt500

a =10 for Pt1000

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4. CONSTRUCTION

0.4

0.5 L

+133

L

0.4

DN20 or DN25

0.4

DN20 or DN25

L+

131

L

L

L

L+

13

1

L

L+

18

2

Thermowell

GB

(AZ-0718)

Thermowell

GN

(AZ-0721)

Thermowell

SW

(AZ-0729)

Mineral insulated cable:

RTD - AZ-0749

TC - AZ-0751

Connection head AS1 - AZ-0711


Connection head NS1 - AZ-0715

Connection head NS2 - AZ-0716



Mineral insulated cable

with transmitter:

RTD - AZ-0750

TC - AZ-0752

Thermowell

SWG

(AZ-0731)

Thermowell

SWT

(AZ-0732)

Thermowell

T

(AZ-0734)

Thermowell

P

(AZ-0726)

0.4

L

L+

18

2

11

5

13

0

0.5

L

Temperature sensors consist of flameproof connection head and exchangeable measuring insert

mineral insulated cable, in which is situated single or double resistor or one or two termocouple.

In each case, hole d1 (see table 7) in connection head body with mineral insulated cable create

flameproof joint. In case of temperature sensors with additional thermowell and flameproof joint in

hole d1, these element create mechanical separation – additional flameproof element. Connection heads

AS1, AS2, AS3, AS4 and NS1, NS2 have separately EC-type examination certyfication: FTZÚ 03

ATEX 0074U and FTZÚ 06 ATEX 0326U. Inside connection head on insert flange is mounted

terminal block, transmitter or transmitter with display. Connection heads are equipped i cable gland

with thread M20x1,5 II 2GD Ex d IIC or I M2 Exd I. Temperature sensors intended for use

in group I should content additional thermowell.

L – immersion length

Fig. 1

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Connection heads

Connection heads AS1, AS2, AS3, AS4 and NS1, NS2 are made on aluminium die-casting or

stainless steel and content three flameproof joint:

a) Cover thread M80x1,5. Connection head cover is protected by wrench-head screw 2mm.

b) Socket thread for cable gland M20x1,5. Connection head are equipped in one or two cable

gland.

c) Flameproof joint Ø6,1; Ø8,1; Ø10,1 for mineral insert and process thread (1/2”NPTmod).

TABLE 7

Connection head

Technical data:

performace: flameproof Ex d

material: aluminium die-casting Mg < 6%

cover seal: silicon rubber or fluoroelastomer VR1

coating: creodure spray enamel, color alu: Cal

service temperature: -50 ÷ 150°C for silicon rubber

-20 ÷ 200°C for fluoroelastomer VR1 rubber

EC-type examination certificate FTZÚ 03 ATEX 0074U

Technical data:


material: stainless steel 1.4401, 1.4301, 1.4541

cover seal: silicon rubber or fluoroelastomer VR1

service temperature: -50 ÷ 150°C for silicon rubber

-20 ÷ 200°C for fluoroelastomer VR1 rubber

EC-type examination certyficate: FTZÚ 06 ATEX 0326U

AS1

standard cover

one cable gland Exd

M20x1,5

NS1

standard cover

one cable gland Exd

M20x1,5

AS2

standard cover

two cable gland Exd

M20x1,5

NS2

standard cover

two cable gland Exd

M20x1,5

d1

Ø6,1H8

Ø8,1H8

Ø10,1H7

d1

1/2NPTmod

d1

Ø6,1H8

Ø8,1H8

Ø10,1H7

d1

Ø6,1H8

Ø8,1H8

Ø10,1H7

d1

Ø6,1H8

Ø8,1H8

Ø10,1H7

d1

1/2NPTmod

d1

1/2NPTmod

zaślepiony

d1

1/2NPTmod

zaślepiony

Fig. 2

Fig. 3

Fig. 4

Fig. 5

blinded blinded

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d1

Ø6,1H8

Ø8,1H8

Ø10,1H7

TABLE 8

Connection head with display

Technical data


material: aluminium die-casting Mg < 6%

cover seal: silicon rubber

coating: creodure spray enamel, color alu: Cal

window material: glass

service temperature: -40 ÷ 85°C

EC-type examination certificate: FTZÚ 03 ATEX 0074U

AS3

cover with window

one cable gland Exd

LED display type LPI-02

non intrinsically safe

AS4

cover with window

two cable gland Exd

LED display type LPI-02

non intrinsically safe

d1

Ø6,1H8

Ø8,1H8

Ø10,1H7

Fig. 6 Fig. 7

display display

blinded

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CABLE GLANDS

`

Connection heads are equipped in different cable glands, it depends on group (I or II), wires

type and wires diameter e.g.:

Cable gland type 8163 firm STAHL. Service temperature -60°C to +130°C, IP66 to IP68.

Atest Sira 06 ATEX 1188X; I M2 Ex d I.

Cable gland type 501/421 firm HAWKE International for non-armoured cables. Service

temperature -60°C to +100°C for zones 1, 21, 2, 22 for gas group IIA, IIB, IIC, degree

protection IP68. Atest Baseefa 06 ATEX 2070X; II 2 GD Ex d IIC.

Cable gland type 501/453 firm HAWKE International for armoured and braided cables. Service

temperature -60°C to +100°C for zone 1, 21, 2, 22 for gas group IIA, IIB, IIC, degree

protection IP66 to IP68. Atest Bassefa 06 ATEX 2078X; II 2 GD Ex d IIC.

Cable gland type 623 firm HAWKE International. Service temperature -60°C to +80°C, degree

protection IP66 to IP68. Atest Bassefa 06 ATEX 0177X; I M2 Ex d I.

Another cable glands Ex d with ATEX, degree protection IP66÷68.

firm HAWKE

type 501/421

firm HAWKE

type 501/453

firm HAWKE

type 623 firm PROTEX

no. 88845 or

88924

firm STAHL

type. 8163/1-A2F

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PROGRAMMABLE LOOP POWERED LED DISPLAY – type LPI-02

ONLY FOR CONNECTION HEADS AS3 and AS4

TABLE 9 TECHNICAL DATA

Performances Functionalities

Reference operating condition 25ºC Parameters Zero, span, decimal point, refresh rate,

unit

Max. measured error 0,1% of the programmed range+/-

1digit Indication limits -1999 to +9999

Influence of ambient temperature

(temp. drift)

20ppm/ºC of measuring range at

20ºC of reference temperature Programmable range -1999 to +9999

Output signal 4...20 mA Decimal point position 0,1,2,3 decimals

Supply voltage 24V (10...30V) Over-load limits From 3.5 to 20.5 mA

Voltage drop out 3,3V at 4mA 3,7V at 20mA

Minimum curent of LED

activation 3,5 mA

Refresh rate From 1 to 10 second

Display LED, 4 digits 7 segments, hight

9,5mm

Visible dimension 30x14 Calibration points Zero (4 mA) and span (20 mA), stored

on FLASCH

Display characteristics 6400ucd for If=10mA Unit ºC, ºF, ºK, % in cycle: 4sec. value - 2sec unit

Data storage FLASCH Mechanical construction

Storage period 10 years (non powered) Electrical loop connection 2 terminals, max. wire section 1mm²

(16 AWG)

Mounting 4 holes/90º Ø 2,6 , Ø 68 Dimension Ø73 x 19 mm

Operating conditions Weight 75g

Ambient temperature -20...80ºC

Short mark display closed

in the connection haed or

hausings

....dig – standard version

Storage temperature -30...80ºC

Application, Fixing

XD-AD dig - directly by screw

2xM2,5x 12

XD-ADF dig - directly by screw

2xM2,5x 12 XD-I dig – fixing kit:

KD-L2

Moisture 25 do 95% bez kondensacji

Ingress protection IP 20

Electromagnetic compatibility carried out with positive results

EN 61000, EN 55022

Fig. 8 Fig. 9

LOOP POWERED INDICATOR

transmitter

Loop powered

4...20mA

10...30V

+C- C

+

-

+

-

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5. INSTALLATION

A. ON THE BORDER OF TWO ZONES: 0; 20 and ZONE: 1; 21,

STREFA ZAGROŻONA WYBUCHEM

Zone 1, 2

Zone 21, 22

STREFA

NIEZAGROŻONA

WYBUCHEM

STREFA ZAGROŻONA

WYBUCHEM

Zone 0, 20

Tamb = -20 ÷ 60°C

p = 0,8 ÷ 1,1 [bar]

SYGNAŁ ia ZASILACZ

+ +

PALIWO

1 1

2

1

Tamb

B. CONNECTION HEAD AND EXTENSION PIPE IN THE ZONES 1, 21,

IMMERSION PART OUT OF ZONE

Zone 1, 2 II 2GD

Zone 21, 22 II 3GD

Proces

1

2

- Sealed thread, to ensure tightness from measuring process. Parallel threads to be sealed on

the collar. Taper threads to be sealed by teflon tape or sealing material (e.g. LOCTITE).

Flange joint with gasket.

- Cable glands ATEX II 2GD Ex d IIC or I M2 Exd I suitable for cable diameter. IP

min 65.

1

2

Fig. 10

Fig. 11

HAZARDOUS AREAS

ZONE 0, 20

Tamb= -20 ÷ 60 ºC

P = 0,8 ÷ 1,1 [bar]

HAZARDOUS AREAS

Zone 1

Zone 21

Zone 1, 21

Strefa 21, 22

HAZARDOUS

AREAS

fuel

POWER

SUPPLY

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Generally, all temperature sensors install in optionally work position. Dependent on

thermowell kind, work place - follow a rule:

Temperature sensors should installed (if possible) in available work place, in order to service

easy method and allow to change mineral insert.

A few metres long temperature sensors (particularly at high temperature) install in vertical

position.

Temperature sensors install in pipeline, in order to resistor or thermocouple fare a pipeline axis.

During install temperature sensors with thermowell intended for weld, mineral insert screw off

during weld and protected inside thermowell, e.g. plug.

During install flameproof temperature sensors should take into account thermowell conduction

of heat and ambient temperature, in order to assure suitable temperature class of temperature

sensor.

Table 10. TIGHTENING MOMENTS FOR THREAD JOINTS

Tightening moments for thermowells and compression fittings

Type of thread Max tightening moment [Nm]

M20×1,5; G1/2; 1/2NPT 115

M24×1,5 200

M27×2; G3/4; 3/4NPT 275

M33×2; G1; 1NPT 506

Tightening moments for screws of flange joints

Screw - nut Class of screw Class of nut Max tightening moment for nut [Nm]

Screw M12×1,5 with steel

nut, zinc-plated

5.8 5 50

8.8 8 94

10.9 10 125

12.9 12 150

Tightening moment for press caps of threaded compression fittings (sensor fixing)

Type of compression fitting Max tightening moment [Nm]

UG-8-12 275

UG-8-15 375

\

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6. CONNECTION OF SENSOR TO THE UNINTRINSICALLY SAFE CIRCUIT.

Resistors and thermocouple can co-operated with different instruments (measuring instruments,

regulators or transmitters with output signal 4…20 mA, 0÷10V).

Maximal electrical parameters:

Maximal voltage: Ui = 10V

Maximal current Ii = 10 mA for Pt100; Ii = 3 mA for Pt1000, Pt 500

Maximal power: Pi = 50 mW

Way of marking resistance terminal

2xP

t100/2

Pt1

00/2

Pt1

00/3

Pt1

00/4

2xP

t100/3

white

white white white

white

white

black

red red

black

black

yellow yellow

red

red red red

red

red

2-wires 3-wires

2-wires 4-wires3-wires

Fig. 12

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Diagram of connection thermocouple insert

1 3

3

2

4

4

Double thermocouple 2 x K or 2 x J or 2 x T or 2 x N

Single thermocouple 1 x K or 1 x J or 1 x T or 1 x N

1

4

3

2

5

6

+

++

-

--

Marking "+" for plus thermocouple.

For :

J - grey

K- green

N- red

T- brown

For double thermocouple one circuits

marking, marking two terminals '' O ''

Sensor grounding

Sensor enclosure can be grounded locally to the structure. When it is not sure that this metallic

connection (by threated connector of the sensor thermowell) is enough good, the sensor housing to be

grounded by wire with cross section minimum 4mm2 in accordance to scheme below.

wire 4 mm2, insulation

up to 150°C, yellow-green

wire 4 mm2, insulation

up to 150°C, yellow-green

grounding

! Data sheets contents diagrams of transmitter connection.

Fig. 13

Fig. 14 Fig. 15

- 17 -


FlexTop 2211 FlexTop 2221 FlexTop 2231 IPAQ-H APAQ LTT-03 B

Output

signal 4..20 mA 4..20 mA 11 mA ± 1 mA 4..20 mA 4..20 mA 4..20 mA

Supply

voltage 6,5..30V DC 8..35V DC 9..32V DC 6,5..36V DC 6,5..32V DC 7,5..30V DC

Burden

resistance

U-6,5V

Robc.= 23mA

U-12V

Robc.= 23mA

U-9V

Robc.= 23mA

U-6,5V

Robc.= 22mA

U-6,5V

Robc.= 25mA

U-7,5V

Robc.= 22mA

Circuit

galvanic

isolation

U < 30 VDC < 30 VDC < 20 VDC 1500VAC\1min -

I < 0,1 A < 0,1 A < 100 mA - -

P < 0,75 W < 0,75 W < 0,75 W - -

Communica-

tion way - HART HCF

Profibus PA

ver. 3,0 VPD 1 - - -

Explosion

protection

concept

Non

intrinsically safe

Non

intrinsically safe

Non

intrinsically safe

Non

intrinsically

safe

Non

intrinsically

safe

Non

intrinsically

safe

Interference

emission EN-50 982-2 EN-50 982-2 EN 61 326 - -

EN 61 326

class B

Noise

immunity EN-50 981-1 EN-50 981-1 EN 61 326 - -

Industrial

requirements

MESO-H LTT-01 LTT-01-H ROSEMOUNT

248H

Output

signal 4..20 mA 4..20 mA 4..20 mA 4..20 mA

Supply

voltage 10..42V DC - 10..35V DC 18..42V DC

Burden

resistance

U-10V

Robc.= 23mA

U-8V

Robc.= 22mA

U-10V

Robc.= 22mA R > 250Ω

Circuit

galvanic

isolation

U - 3,75 kV / 50Hz - 500VAC

I - - - -

P - - - -

Communica-

tion way HART - HART HART

Explosion

protection

concept

Non

intrinsically safe

Non

intrinsically safe

Non

intrinsically safe

Intrinsically

safe

Interference

emission - -

EN 61 326

class B -

Noise

immunity - -

Industrial

requirements -

Table 11: TECHNICAL DATA OF TRANSMITTER USED EXCHANGEABLE IN THE

SENSORS

- 18 -


7. GUIDELINE FOR ESTIMATION OF TEMPERATURE CLASS OF THE SENSOR

– gas potential explosive atmosphere G.

Temperature class of the apparatus determine its the hottest surface, which can appear

during normal operation, it means temperature measurement of the process in the measuring

range.

Because sensor manufacturer is not able foreseen actually operation condition of the

sensor, on the data sheets and certificate was declared temperature class responding top

temperature declared measuring range regardless influence of ambient Tamb and self-heating Te

temperature.

Actually maximum surface temperature and responding temperature class of sensor

working on the object can be lower than declared by sensor producer in accordance to Table 1.

in the standard EN 60079-0.

The hottest sensor surface can be surface of electronic transmitter, connection heads or

surfaces around sensing element (RTD, TC).

If process temperature Tp is lower than ambient temperature Tamb the hottest surface of

the sensor will be surface of transmitter / connection head.

Tp < Tamb

TabLE 12: SENSORS WITHOUT TRANSMITTER

Sensor type Measuring

range

Range of

temperature class

Ambient

temperature

Tamb

The hottest surface in the

most disadvantageous

conditions

Category II 2 G,

All types with and

without

thermowell

RTD

TC

(-20 ÷ 60°C)

-200°C ÷ Tamb

-40°C ÷ Tamb

T6 -40 ÷ 75°C (connection head, Fig. 16)

Connection head, Fig. 17

- 19 -


Table 13: SENSORS WITH TRANSMITTER


range

Range of

temperature class

Ambient

temperature

Tamb



conditions

Category II 2 G,

All types with and

without

thermowell

RTD

TC

(-20 ÷ 60°C)

-200°C ÷ Tamb

-40°C ÷ Tamb

T5

See table

no. 15

(connection head, Fig. 16)


T6

Tx – maximal temperature Tamb for temperature class for type of used transmitter

Table 14: SENSORS WITH TRANSMITTER* AND DISPLAY


range

Range of

temperature class

Ambient

temperature

Tamb



conditions

Category II 2 G,

All types with and

without

thermowell

RTD

TC

(-20 ÷ 60°C)

-200°C ÷ Tamb

-40°C ÷ Tamb

T6 -40 ÷ 80°C (connection head, Fig. 16)


transmitter APAQ

Retain temperature class of connection head is limited by inside power dissipation and

depends on connection head type according to table no. 15 (Values Proz. in brackets for

connection heads NS1, NS2 while the rest for connection heads AS1, AS2, AS3, AS4).

Table 15: MAXIMAL DISSIPATION POWER FOR CONNECTION HEAD

CLASS TEMPERATURE

Tamb. Class T6

ΔT[K]

Max.

Proz. [W]

Class T5

ΔT[K]

Max.

Proz. [W]

40ºC 40K 10 (9) 55K 15,5 (13)

55ºC 25K 6,0 (4,7) 40K 10,0 (9)

70ºC 10K 1,9 (1,45) 25K 6,0 (4,7)

85ºC -- -- 10K 1,9(1,45)

- 20 -


If process temperature Tp is higher than ambient temperature Tamb the sensor surface

will be heated by process temperature Tp and ambient temperature Tamb.

Tp > Tamb

In case of sensors working in the explosion atmospheres when Tp > Tamb the hottest

places of the sensor are:

the tip of the measuring insert – outer surface has contact with explosive gas mixture.

Table 16: SENSORS WITHOUT TRANSMITTER,

SENSORS WITH TRANSMITTER, WITH TRANSMITTER AND DISPLAY


range *

Range of

temperature

class

Ambient

temperature

The hottest surface

in the most

disadvantageous

conditions

Category II 2 G,

All sensors type except:

sensors with thermowell

GB and sensors without

thermowell (T..I)

RTD

TC J

TC K

TC T

TC N

Tamb ÷ 450°C

Tamb ÷ 450°C

Tamb ÷ 450°C

Tamb ÷ 350°C

Tamb ÷ 450°C

T1...T6

T1...T6

T1...T6

350°C...T6

T1...T6

-40 ÷ 75°C

without

transmitter

with transmitter

(see table no. 15)

-40 ÷ 80°C

with transmitter

and display

inner surface of the

thermowell bottom outer surface of the tip

of measuring insert

Fig. 17

Sensor TOPGB,

APTOPGB

Sensor TT(J,K,T,N)GB

APTT(J,K,T,N)GB

Sensor TOPI, APTOPI

Sensor TTJI, APTTJI

Sensor TTTI, APTTTI

Sensor TTKI, APTTKI

Sensor TTNI, APTTNI

Tamb ÷ 135°C

Tamb ÷ 135°C

Tamb ÷ 600°C

Tamb ÷ 700°C

Tamb ÷ 350°C

Tamb ÷ 1200°C

Tamb ÷ 1200°C

T4...T6

T4...T6

T 600°C...T6

T 700°C...T6

T 350°C...T6

T 1200°C...T6

T 1200°C...T6

-40 ÷ 75°C

without

transmitter

with transmitter

(see table no. 15)

-40 ÷ 80°C

with transmitter

and display

tip of measuring

insert or Fig. 18

outer sheath of

measuring insert behind

compression fitting

Fig. 19

* without influence of ambient temperature Tamb and self-heating Te

Tx – maximal temperature Tamb for temperature class for type of used transmitter

- 21 -


≤

Tamb = -20 ÷ 60°C

p = 0,8 ÷ 1,1 [bar]

Zone 1, II 2 G

Zone 2, II 3 G

Zone 0, II 1 G

IP 67

IP 68

II 1/2 G

Tamb

! For sensors working on Zone 0 / 1 border the temperature class

of the sensor is T6

II 2 G

II 3 G

Zone 1,

Zone 2,

Tamb

TPmax obudowa

Max. temp. procesu dopuszczalna temperatura klasy dla danej substancji (rodzaj gazu lub pary)

maksymalna

temperatura

powierzchni

= TSmax

TPmax T1...T6

! For all sensors except (T..I), the max process temperature Tpmax must not

be higher than the temperature of temperature class for surrounding

explosive mixture.

Fig. 16

Fig. 17

II 2 G

enclosure

maximal

surface

temperature

= Tsmax

Maximal process temperature ≤ Permissible temperature for temperature class of

surrounding gas, mist, vapour type

- 22 -


TPmax

TPmax

TPmax

insulation

insulation

Process

TSmax<Tignition

TSmax<Tignition

TSmax

mineral insulatedcable

mineral insulatedthermocouple

mineral insulatedcable

gastightcompressionfitting IP68

gastightcompressionfitting IP68

II 2 GD

II 3 GD

II 2 GD

II 3 GD

II 2 GD

II 3 GD

TPmax > T°C...T6

TSmax < T°C...T6

! For sensors (T..I), the max process temperature Tpmax can be higher than

class temperature for present explosion mixture under condition, that

conducting heat and radiation heat from temperature process Tp do not

worm none sensor surface exposed to explosion atmosphere higher than

ignition temperature of the explosive mixture.

! Designer of the installation is responsible for such sensor type choosing

and way his installation so as to after sensor installation during extreme

working conditions temperature of the hottest surface will be lower than

temperature of class temperature for surrounding gas, mist, vaporous type.

7. GUIDELINE FOR ESTIMATION OF MAXIMAL PERMISSIBLE SURFACE

TEMPERATURE OF THE SENSOR – dust explosive atmosphere D.

Maximal surface temperature of the sensor can be reached during operation in extreme

conditions. Because tightness of the sensor is IP6X (dust-tight enclosure) dust must not ingress

inside and this concerns outside surface of the sensor.

If process temperature Tp is higher than ambient temperature Tamb sensor surfaces will

be wormed by process temperature Tp, ambient temperature Tamb and self-heating.

Fig. 18

Fig. 19

Fig. 20

- 23 -


Maximum surface temperature of the sensor having contact with explosive dust mixture

must not exceed 2/3 self-inflammation temperature of dust cloud or 75K lower from self-

ignition temperature of dust layer thickness up to 5mm (p.6.1 and 6.2 PN-EN 61241-0).

Table 17. PART OF TEXT „Mieszaniny wybuchowe”;

in accordance with Code NF PA 325 M-1984

Dust

Self-inflammation

temperature for Minimum

inflammation energy

(cloud)

(mJ)

Minimum explosion

concentration (cloud)

[g/m3] Layer Cloud

Agricultural dust

Starch (wheat) 380 400 25 25

Peanuts (husks) 210 460 50 45

Wheat (bulk) 220 500 60 65

Wood / pine (sawdust) 260 470 40 35

Cocoa 240 510 100 75

Unprocessed cotton 520 - 100 190

Cellulose 270 480 80 55

Dextrin 390 410 40 40

Flour / wheat 440 440 60 50

Corn starch - 380 30 40

Milk powder 200 490 50 50

Cork 210 460 35 35

Malt 250 400 35 35

Rice 450 510 100 85

Soya (flour) 340 550 100 60

Sugar 400 370 30 45

Metallic dust

Ground aluminium (*) 460-900 550-700 50-120 45-120

Aluminium flakes (*) 400-900 600-700 10-100 40-60

Aluminium powder (*) 490-700 550-800 15-160 40-140

Tin 430 630 80 190

Ferro-titanium 400 370 80 140

Magnesium aluminium 480 430 80 20

Silicon 950 780 96 160

Thorium 280 270 5 75

Uranium 100 20 45 60

Zinc 540 690 960 460

Carbonated materials

Adipic acid - 550 60 35

Fumaric acid - 520 35 85

Dicumyl peroxide 180 560 30 45

- 24 -


Soap 500 640 120 83

Sulphur 220 190 15 35

Vitamin B1 nitrate - 360 60 35

Vitamin C (ascorbic acid) 280 460 60 70

Chemicals

Asphalt 550 510 40 35

Tar - 630 25 45

Bituminous coal 180 610 30 50

Charcoal 180 530 20 140

Graphite 580 - - -

Lignite 200 450 30 30

Plastic, rubber

Carboxymethylcellulose 310 460 140 60

Ethylcellulose 350 370 10 25

Methylcellulose 340 360 - 30

Polyvinyl accate - 550 160 40

Polyacrylonitrile 460 500 20 25

Polyethylene 380 450 30 20

Sodium resinate 220 350 60 40

Viscose (rayon) 250 520 240 55

Polypropylene - 420 30 20

(*) Depending on size grading and manufacture process

In case other type of dusts has not been mentioned in the above table TSmax shall be

evaluated on the base relevant standards and scores of testing.

Tamb = -20 ÷ 60°C

p = 0,8 ÷ 1,1 [bar]

II 2 D

II 3 D

II 1 D

II 1/2 D

Zone 21

Zone 22

Zone 20

TPmax

TSmax

Tamb

TP, TS

obudowa

TSmax

obudowa

Fig. 21

enclosure

II 2 D

enclosure

- 25 -


II 2 D; II 3 D;

Zone 21

Zone 22

TP - temperatura

procesu

TSmax - maksymalna

temperatura

powierzchni

Tamb

obudowa

! Designer of the installation is responsible for such sensor choosing and

way his installation so as to after sensor installation during extreme working

conditions, temperature the hottest surface will not be higher than 2/3 of

dust cloud self-inflammation temperature TCl or dust layer self-

inflammation temperature T5mm – 75K.

Other cases of using sensor and adequate conditions are given by standard

PN-EN 61241-0.

8. ENVIRONMENTAL CONDITIONS

Ambient temperature depend on sensor type acc. to Table: 12, 13, 14, 16,

Humidity max 80%,

Sensors are designed to use indoor and outdoor location.

9. TIGHTNESS. IP DEGREE.

Ordered in Limatherm Sensor Sp. z o.o. sensor can equipped with appropriate cable gland:

- for sensor intended for use in potentially gas G or dust D explosive atmospheres

ATEX II GD Ex d IIC approved

- for sensor intended for use (group I) ATEX I M2 Ex d I approved

All cable glands are pointed out by LIMATHERM SENSOR, so as to include foreseen to use

cable diameter.

Fig. 22

maximum

surface

temperature

process

temperature

enclosure

- 26 -


In case ordering a sensor without cable gland, fitter is obliged to mount certified cable

gland for destination of sensor (I or II group).

In case of defect mineral insulated cable or loss technical parameters, user can change

it individual.

All parts of the sensors are assembled using tightening moment which ensure comply

declarated IP degree rating. During sensor installation on the object, after electrical connection

to the intrinsically safe circuit shall:

tighten / install cable glands:

Handling shall be done in accordance with gland producer’s manual.

Using screwdriver tighten by hand cover screw.

! Tightening with appropriate moment of cable gland and cover with the

help of screw.

10. DOCUMENTS

To the each sensor is enclosed:

Application manual for sensor.

Application manual for cable gland ATEX approved.

Data sheet for transmitter

Warranty.

Declaration of conformity.

- 27 -


APPENDIX NO 1

Flameproof joint between mineral insert and connection heads XD-AD(win), XD-SD

Ø 6 0.04 - 0.148

0.04 - 0.138

0.04 - 0.142

0.04 - 0.148Ø 6

Ø 10

Ø 3

Ø 8

Ø 6

Ø 4.5

Ø 6.1H8

Ø 6.1H8

Ø 10.1H7

Ø 8.1 H8 Ø 8

+0.06

+0.06

+0.06

+0.06

-0.03

-0.03

-0.02

-0.03

35

10

d1

dc= ddc

cross section

flange with short sleeve

flangewith long sleeve

Flameproof joint betweenmineral insert and connection head (only dc = 6 i 8 mm)

Flameproof joint betweeninsert sleeve and connection head

XD-AD(win), XD-SD

mineral insulated cable

d

Mineral insertdc [mm]

d mm]1 [ d [mm]flameproofjoint [mm]

SAFETY INSTRUCTION - Limatherm · PDF file- 5 - LIMATHERM SENSOR Sp. z o.o., 34-600 Limanowa,...

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Transcript of SAFETY INSTRUCTION - Limatherm · PDF file- 5 - LIMATHERM SENSOR Sp. z o.o., 34-600 Limanowa,...